Unknown severity · Source severity not reportedCVE-2026-31606

usb: gadget: f_hid: don't call cdev_init while cdev in useCVE-2026-31606

Answer in brief

CVE-2026-31606 records a Unknown severity vulnerability in usb: gadget: f_hid: don't call cdev_init while cdev in use. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 24, 2026Updated Oct 21, 2026Source checked Oct 21, 2026First seen by HOL Oct 21, 2026Material review Oct 21, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=cb382536052fcc7713988869b54a81137069e5a9 <3aa77f5da0ecb00895411f4246d8a3e4db0343c2 \|\| >=cb382536052fcc7713988869b54a81137069e5a9 <c6c0d13db5d0f8d465eabc14bd23d2b6a7247a43 \|\| >=cb382536052fcc7713988869b54a81137069e5a9 <eb6ef6185f2054a341ec70d7e2165f5381744215 \|\| >=cb382536052fcc7713988869b54a81137069e5a9 <5a229016ca3ac551294ec59770be9da94ec4bf63 \|\| >=cb382536052fcc7713988869b54a81137069e5a9 <75ecc46828ec377dd5692c677168ef6d64fd7123 \|\| >=cb382536052fcc7713988869b54a81137069e5a9 <81ebd43cc0d6d106ce7b6ccbf7b5e40ca7f5503d	3aa77f5da0ecb00895411f4246d8a3e4db0343c2, c6c0d13db5d0f8d465eabc14bd23d2b6a7247a43, eb6ef6185f2054a341ec70d7e2165f5381744215, 5a229016ca3ac551294ec59770be9da94ec4bf63, 75ecc46828ec377dd5692c677168ef6d64fd7123, 81ebd43cc0d6d106ce7b6ccbf7b5e40ca7f5503d
Linux/Linuxgeneric	3.19	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 3aa77f5da0ecb00895411f4246d8a3e4db0343c2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Apr 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 21, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_hid: don't call cdev_init while cdev in use When calling unbind, then bind again, cdev_init reinitialized the cdev, even though there may still be references to it. That's the case when the /dev/hidg* device is still opened. This obviously unsafe behavior like oopes. This fixes this by using cdev_alloc to put the cdev on the heap. That way, we can simply allocate a new one in hidg_bind.

Quoted source text, attributed separately from HOL analysis.